I went to the hospital that day, then saw two different specialists, and the only prescription I received was for Ambien so I could at least get a night’s sleep. Even on day three I could barely drive it was so distracting.
I woke up on day four and it was totally gone. Like it’d just been a terrible dream. I still went to the audiologist the next day to follow up, he said that sometimes that just happens, and posited that it might have been neurological. He did suggest more tests, but I never followed up.
I doubt this is helpful to your case, but it’s an example proof of _something_.
My pet theory is that it was related to my migraines - I have very significant visual auras with migraines, which can last up to a day. Maybe this was an auditory equivalent which lasted much longer? (I like this theory more than worrying about a brain tumour, so please don’t tell me it’s impossible.)